was a

district A district is a type of administrative division that, in some countries, is managed by the local government. Across the world, areas known as "districts" vary greatly in size, spanning regions or counties, several municipalities, subdivisions o ...

located in

Niigata Prefecture is a Prefectures of Japan, prefecture in the Chūbu region of Honshu of Japan. Niigata Prefecture has a population of 2,227,496 (1 July 2019) and is the List of Japanese prefectures by area, fifth-largest prefecture of Japan by geographic area ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. As of 2003, the district had an estimated

population Population typically refers to the number of people in a single area, whether it be a city or town, region, country, continent, or the world. Governments typically quantify the size of the resident population within their jurisdiction using a ...

of 2,035 and a

density Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' can also be used. Mathematical ...

of 51.09 persons per km². The total area is 39.83 km².

Towns and villages

* Yamakoshi

Merger and dissolution

*On April 1, 2005 - the village of Yamakoshi, along with the town of Oguni (from Kariwa District), the town of

Nakanoshima is a 3 km long and 50 hectares narrow sandbank in Kita-ku, Osaka city, Japan, that divides the Kyū-Yodo into the Tosabori and Dōjima rivers. Many governmental and commercial offices (including the city hall of Osaka), museums and other ...

(from Minamikanbara District), and the towns of Koshiji and

Mishima Mishima may refer to: Places * Mishima, Fukushima, a town in Fukushima Prefecture * Mishima, Kagoshima, a village in Kagoshima Prefecture * Mishima, Niigata, a town in Niigata Prefecture * Mishima, Shizuoka, a city in Shizuoka Prefecture, Japan ...

(both from Santō District), was merged into the expanded city of Nagaoka. Koshi District was dissolved as a result of this merger. Former districts of Niigata Prefecture {{Niigata-geo-stub